Common nouns of lithium-ion batteries and types of rechargeable batteries

Common nouns of lithium-ion batteries 1. Battery capacity (mah): The capacity of the battery is usually calculated by AH (Ampere/Hour). Since the capacity is usually small in model aircraft, it is accurate to mAH (Milliamp/Hour). In fact, the correct expression of mah is mA/H. m represents the unit millisecond, A represents the current unit ampere, and H represents the time unit hour. For example, 2200mah means that the battery can be discharged at a constant current of 2200 mA for 1 hour, and the amount of electricity released is the capacity of the battery. 2. Discharge rate (c number): In addition to the battery capacity, the more important thing is the discharge rate, which is the C number we often say! 1C means double the discharge current. For example, for a 2200mah battery, 1C currentu003d2.2A, then 30C is: 2.2A×30Cu003d66A. This is the maximum output current of the battery. 3. Section (S): Lithium-ion battery cell voltage is 3.7V, a single cell is called CELL, or S is used to express, if you want to obtain higher voltage, you need to connect multiple cells in series Superposition, such as 2S (3.7+3.7u003d7.4V), 3S (11.1V) and so on. The type of rechargeable battery. Nickel-cadmium battery (Ni-Cd) voltage: 1.2V, service life: 500 times, discharge temperature: -20°C~ The charging temperature at 60 degrees is: 0 degrees to 45 degrees. Remarks: Strong overcharge resistance. Ni-MH battery (Ni-MH) voltage: 1.2V, service life: 1000 times of discharge temperature: -10 degrees to 45 degrees, charging temperature: 10 degrees to 45 degrees Remarks: the current maximum capacity is about 2100mAh. Lithium-ion battery (Li-lon) voltage: 3.6V Service life: 500 times Discharge temperature: -20℃～60℃ Charging temperature: 0℃～45℃ Remarks: The weight is 30%～40% lighter than Ni-MH battery , The capacity is more than 60% higher than the nickel-hydrogen battery. But it is not resistant to overcharging, if overcharging will cause the temperature to be too high and destroy the structure u003du003e explosion. Li-polymer battery (Li-polymer) voltage: 3.7V, service life: 500 times, discharge temperature: -20 degrees to 60 degrees, charging temperature: 0 degrees to 45 degrees Remarks: an improved type of lithium battery, no battery fluid, and Using polymer electrolytes can be made into various shapes, which is more stable than lithium-ion batteries. Lead-acid battery (Sealed) voltage: 2V Service life: 200～300 times Discharge temperature: 0℃～45℃ Charging temperature: 0℃～45℃ Remarks: it is a general car battery (it is 6 2V series Into 12V), the service life of the battery without adding water is up to 10 years, but the volume and maximum capacity are the largest. Explanation of terms for battery charging Charge rate (C-rate) C is the first letter of Capacity, which is used to indicate the magnitude of the current when the battery is charged and discharged. For example: when the rated capacity of the rechargeable battery is 1100mAh, it means that the discharge time of 1100mAh (1C) can last for 1 hour. For example, the discharge time of 200mA (0.2C) can last for 5 hours. The charging can also be calculated according to this comparison. Cut-offdischargevoltage refers to the lowest working voltage value when the battery discharges, the voltage drops to the battery which is no longer suitable for discharging. According to different battery types and different discharge conditions, the requirements for the capacity and life of the battery are also different, so the specified terminal voltage of the battery discharge is also different. Open circuit voltage (OpencircuitvoltageOCV) When the battery is not discharged, the potential difference between the two electrodes of the battery is called the open circuit voltage. The open circuit voltage of the battery will vary depending on the battery's positive, negative and electrolyte materials. If the materials of the battery's positive and negative electrodes are exactly the same, the open circuit voltage will be the same regardless of the size of the battery and how the geometric structure changes. Depth of Discharge (DepthofdischargeDOD) In u200bu200bthe process of battery use, the battery's discharge capacity accounts for the percentage of its rated capacity, which is called the depth of discharge. The depth of discharge has a deep relationship with the charging life of the secondary battery. When the depth of discharge of the secondary battery is deeper, the charging life will be shorter. Therefore, you should try to prevent deep discharge when using it. Overdischarge (Overdischarge) If the battery exceeds the termination voltage of the battery during the discharge process, the internal pressure of the battery may increase when the battery continues to be discharged, and the reversibility of the positive and negative active materials will be damaged, which will make the battery capacity There is a significant reduction. Overcharged (Overcharge) battery during charging, after reaching a fully charged state, if you continue to charge, it may cause the battery internal pressure to rise, battery deformation, leakage at night, etc., the battery performance will also be significantly reduced and damaged. Energy density (Energydensity) The electric energy released by the average unit volume or mass of a battery. Generally, in the same volume, the energy density of lithium-ion batteries is 2.5 times that of nickel-cadmium batteries and 1.8 times that of nickel-hydrogen batteries. Therefore, when the battery capacity is equal, lithium-ion batteries will be better than nickel-cadmium and nickel-hydrogen batteries. Smaller size and lighter weight. Self-discharge (Selfdischarge) batteries, regardless of whether they are used or not, due to various reasons, will cause the phenomenon of power loss. If calculated in a month, the self-discharge of lithium-ion batteries is about 1%-2%, and the self-discharge of nickel-hydrogen batteries is about 3%-5%. Cyclelife (Cyclelife) rechargeable batteries are used repeatedly to charge and discharge, the battery capacity gradually decreases to 60%-80% of the initial capacity. Memory effect (Memoryeffect) During the process of battery charging and discharging, many small bubbles will appear on the battery plate. Over time, these bubbles will reduce the area of u200bu200bthe battery plate and indirectly affect the battery capacity. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Is it better for lithium-ion batteries or lead-acid batteries in winter?